Apparatus for weighting golf club shaft
Summary by NHIP
Expandable Golf Club Weighting Device
The device inserts a weighted assembly into a hollow shaft to add mass. A screw with a cap and elongated barrel draws a lower member into an upper cylindrical member, compressing a deformable expansion ring between them until it expands radially to achieve a friction fit against the shaft's inner surface.
Claim Score by NHIP
Abstract
An apparatus for selectively adding weight to the hollow shaft of a hand-held implement. One embodiment includes an upper cylindrical member, a lower member, and an expansion ring that fits between the upper and lower members. These components are sized slightly smaller than the inside diameter of a hollow shaft, such as a golf club shaft. Each component includes an axial bore, through which a screw with an elongated barrel extends. The axial bore of the upper member is enlarged at its upper terminus to receive the cap of the screw, and the axial bore of the lower member is threaded to receive the screw. This assembly is inserted into a hollow shaft, and as the screw is tightened, the lower member is drawn into the upper member, compressing the expander ring axially causing it to expand radially until a friction fit with the inside surface of the hollow shaft is achieved.
Term
Term ended
Expired 6 January 2024, 2.7 years ago.
- Priority
- Filed
- Granted
- Expired
- Today
11 claims: 4 independent, 7 dependent
- 1A device for adding weight to a hollow shaft of a hand-held implement, said device comprising:a screw comprising an elongate barrel, at least part of which is threaded, and a cap larger in diameter than said barrel;an upper cylindrical member having an upper surface, a lower surface, and side walls, said upper cylindrical member being slightly smaller in diameter than the inside diameter of said hollow shaft and comprising a first post extending from the lower surface of said upper cylindrical member and being concentric therewith, and a first axial bore, slightly larger in diameter than the barrel of said screw, extending through said upper cylindrical member including through said first post, wherein an upper portion of said first bore is enlarged to receive the cap of said screw;a lower member having an upper surface, a lower surface, and side walls, said lower member being slightly smaller in diameter than the inside diameter of said hollow shaft and comprising a second post larger in diameter than said first post extending from the upper surface of said lower member and being concentric therewith, and a second axial bore, sized and threaded to receive the barrel of said screw, extending through said second post and into said lower member;and an expansion ring slightly smaller in diameter than the inside diameter of said hollow shaft, located between said upper cylindrical member and said lower member, said ring made of a deformable material, and having a third axial bore therethrough sized to fit snugly onto said first post and to expand radially when fit onto said second post;wherein the barrel of said screw extends through said first and third bores and is threaded into said second axial bore, seating the cap of said screw into the enlarged portion of said first axial bore, such that when said device is inserted into said hollow shaft and said screw is tightened, said cylindrical member and said lower member axially compress said ring and cause it to expand radially against the inner wall of said hollow shaft, thereby fixing the position of said device within said shaft.
- 7A device for adding weight to a hollow shaft of a golf club, said device comprising:a screw comprising an elongate barrel, at least part of which is threaded, and a cap larger in diameter than said barrel;an upper cylindrical member having an upper surface, a lower surface, and side walls, said upper cylindrical member being slightly smaller in diameter than the inside diameter of said hollow shaft and comprising a first post extending from the lower surface of said upper cylindrical member and being concentric therewith, and a first axial bore, slightly larger in diameter than the barrel of said screw, extending through said upper cylindrical member including through said first post, wherein an upper portion of said first bore is enlarged to receive the cap of said screw, the wall of the enlarged portion being threaded to receive a complementarily threaded extraction tool to facilitate removal of said device from said shaft;a lower member having an upper surface, a lower surface, and side walls, said lower member being slightly smaller in diameter than the inside diameter of said hollow shaft and comprising a second post extending from the upper surface of said lower member and being concentric therewith, and a second axial bore, sized and threaded to receive the barrel of said screw, extending through said second post and into said lower member;and an expansion ring slightly smaller in diameter than the inside diameter of said hollow shaft, located between said upper cylindrical member and said lower member, said ring made of a deformable material, and having a third axial bore therethrough sized to fit snugly onto said first and second posts;wherein the barrel of said screw extends through said first and third bores and is threaded into said second axial bore, seating the cap of said screw into the enlarged portion of said first axial bore, such that when said device is inserted into said hollow shaft and said screw is tightened, said cylindrical member and said lower member axially compress said ring and cause it to expand radially against the inner wall of said hollow shaft, thereby fixing the position of said device within said shaft.
- 8A device for adding weight to a hollow shaft of a golf club, said device comprising:a screw comprising an elongate barrel, at least part of which is threaded, and a cap larger in diameter than said barrel;an upper cylindrical member having an upper surface, a lower surface, and side walls, said upper cylindrical member being slightly smaller in diameter than the inside diameter of said hollow shaft and comprising a first post extending from the lower surface of said upper cylindrical member and being concentric therewith, and a first axial bore, slightly larger in diameter than the barrel of said screw, extending through said upper cylindrical member including through said first post, wherein an upper portion of said first bore is enlarged to receive the cap of said screw;a lower member having an upper surface, a lower surface, and side walls, said lower member being slightly smaller in diameter than the inside diameter of said hollow shaft and comprising a second post extending from the upper surface of said lower member and being concentric therewith, and a second axial bore, sized and threaded to receive the barrel of said screw, extending through said second post and into said lower member;and an expansion ring slightly smaller in diameter than the inside diameter of said hollow shaft, located between said upper cylindrical member and said lower member, said ring made of a deformable material, and having a third axial bore therethrough sized to fit snugly onto said first and second posts, said second post being larger in diameter than first post and of sufficient size to radially expand said expansion ring when it is fitted thereon;wherein the barrel of said screw extends through said first and third bores and is threaded into said second axial bore, seating the cap of said screw into the enlarged portion of said first axial bore, such that when said device is inserted into said hollow shaft and said screw is tightened, said cylindrical member and said lower member axially compress said ring and cause it to expand radially against the inner wall of said hollow shaft, thereby fixing the position of said device within said shaft.
- 11Broadest claimClaim Score 44, average(NHIP)A device for fixing a mass within a hollow shaft of a hand-held implement, said device comprising:a screw comprising an elongate barrel, at least part of which is threaded, and a cap larger in diameter than said barrel;an upper member sized to fit within said shaft, and comprising a first post, coaxial with said member and extending downward therefrom, and a first axial bore, slightly larger in diameter than the barrel of said screw, extending through said upper member including through said first post;a lower member sized to fit within said shaft and comprising a second post, coaxial with said lower member and extending upward from said lower member, and a second axial bore extending through said second post and into said lower member and sized and threaded to receive the barrel of said screw;and a deformable expansion ring located between said upper cylindrical member and said lower member, said ring sized to fit within said hollow shaft when in an non-deformed state and sized to fit snugly onto said posts, wherein said second post is larger in diameter than said first post, causing said ring to expand radially when fit onto said second post;wherein the barrel of said screw extends through said first bore and said ring and is threaded into said second axial bore, with the cap of said screw bearing against the upper member, such that when said device is inserted into said hollow shaft and said screw is tightened, said upper and lower members axially compress said ring and cause it to expand radially against the inner wall of said hollow shaft.
Independent claims4
23 paragraphs in 4 sections, as filed
This application is a continuation-in-part of and claims the benefit of U.S. patent application Ser. No. 10/752,126, filed Jan. 6, 2004 now U.S. Pat. No. 7,261,641.
BACKGROUND
The present invention provides an apparatus for improving the dynamic response or feel of a golf club as it strikes a golf ball during play by selectively adding weight to the upper end of the shaft. Although there are many products and prior patents relating to adjusting the swing weight, feel, or balance of a golf club, few if any of these devices are directed towards improving the dynamic response, or feedback, of the club to the golfer at ball impact. Most prior art devices are aimed more specifically at the static or quasi-static feel of the club in the golfer's hand at the initial alignment, or during the back and forward swings. Such devices usually focus on the feel of the club itself, not the feel of the shot through the club. The importance of impact and dynamic response to the golfer's game are often overlooked.
Impact is momentary, but it is at and immediately following this critical moment that the golfer feels his shot through the dynamic response of the club. As many golfers will confess, after impact one often knows where the ball is heading without having to actually see its trajectory. The golfer has only one tactile interface to the club, and that is through his hands which grasp the club's shaft on the grip. It is thus through the golfer's hands gripping the shaft that the dynamic response of the club to the golfer's stroke is communicated. This dynamic response is a result of the vibration characteristics of the club, and the golfer often perceives it simply as feel. Thus it follows that if the club's dynamic response can be increased in this specific gripping area, the golfer will have a better feel for his shot.
The present invention provides an apparatus for improving the dynamic response of the golf club by allowing a golfer to selectively adjust the weight of the club at its grip end. This action in turn enhances the feel of the club to the golfer.
SUMMARY
One embodiment of the present invention comprises an upper cylindrical member and a lower member, an expander ring, and a screw. The upper and lower members, and the expansion ring, are slightly smaller in diameter than the inside diameter of a hollow shaft. The upper cylindrical member includes a post extending from the center of its lower surface and an axial bore through which the screw is passed. The lower member also includes a post extending from the center of its upper surface. The lower member includes a second axial bore extending through the second post and into the main body of the lower member. The second axial bore is threaded to receive the end of the screw. The expander ring, which is generally shaped like a hollow cylinder, fits between the upper and lower members snugly onto their respective posts. The screw extends through the first axial bore in the upper cylindrical member, through the center of the expander ring, and into the second axial bore in the lower member. The first axial bore has a portion of enlarged diameter at its upper terminus for receiving the cap of the screw. The assembly of the first and second members, the expander ring, and screw is inserted into a hollow shaft, such as a golf club shaft. As the screw is tightened into the lower member, it pulls the lower member towards the upper member and compresses the expander ring axially (i.e., longitudinally), causing it to expand radially. This radial expansion causes a portion of the outside surface of the expander ring to bear against the inside wall of the shaft, forming a friction fit to hold the device in place. In an alternative embodiment, the lower member includes an elongated, cylindrical extension extending upward from the second post, through the expander ring, and into the first axial bore of the upper member. The second axial bore extends through this extender, and the screw threads into it. In either embodiment, the second post (on the lower member) may have a diameter slightly larger than that of the first post (on the upper member) sufficient in size to cause the expander ring to expand radially when pressed onto the second post.
DESCRIPTION OF DRAWINGS
These and other features, aspects, structures, advantages, and functions are shown or inherent in, and will become better understood with regard to, the following description and accompanied drawings where:
<figref idref="DRAWINGS">FIG. 1</figref> is a perspective exploded view of one embodiment of the present invention;
<figref idref="DRAWINGS">FIG. 2</figref> is a side sectional view of the embodiment of <figref idref="DRAWINGS">FIG. 1</figref> assembled and installed on a golf club shaft;
<figref idref="DRAWINGS">FIG. 3</figref> is a cross sectional view of the assembly shown in <figref idref="DRAWINGS">FIG. 2</figref>;
<figref idref="DRAWINGS">FIG. 4</figref> is a perspective exploded view of another embodiment of the present invention;
<figref idref="DRAWINGS">FIG. 5</figref> is a side sectional view of the embodiment of <figref idref="DRAWINGS">FIG. 4</figref> assembled and installed on a golf club shaft;
<figref idref="DRAWINGS">FIG. 6</figref> is a cross sectional view of the assembly shown in <figref idref="DRAWINGS">FIG. 5</figref>.
DETAILED DESCRIPTION
The present invention relates to device for adding weight to the end of a hollow shaft for a hand-held implement, such as a golf club. A golf club shaft will be referred to herein as the exemplary application for the device, but it should be understood there are many other applications for the device as well.
One embodiment of the present invention is illustrated in <figref idref="DRAWINGS">FIGS. 1-3</figref>. As shown in <figref idref="DRAWINGS">FIGS. 1-2</figref>, the device <b>10</b> comprises an upper cylindrical member <b>20</b>, a lower member <b>30</b>, a screw <b>40</b>, and an expander ring <b>50</b>. As described in more detail below, the screw <b>40</b> extends through the upper member <b>20</b>, through the expander ring <b>50</b> and into the lower member <b>30</b>. When tightened, the screw <b>40</b> causes the lower member <b>30</b> to be drawn towards the upper member <b>20</b>, thus compressing ring <b>50</b> and causing it to expand radially. This radial expansion creates a friction fit of the device <b>10</b> within a hollow shaft <b>100</b>, as shown in <figref idref="DRAWINGS">FIG. 2</figref>.
The upper cylindrical member <b>20</b> includes a first post <b>22</b> extending down from its bottom surface. The first post <b>22</b> is concentric with (or coaxial with) the upper member <b>20</b>. A first axial bore <b>24</b> extends through the upper member <b>20</b> including through the first post <b>22</b>. The bore <b>24</b> is sized to receive the screw <b>40</b>, with an enlarged portion near the upper terminus to receive the screw's cap <b>44</b> and the remainder sized to accommodate the screw's barrel <b>42</b>. The upper cylindrical member <b>20</b> has a diameter slightly smaller than the inside diameter of the shaft <b>100</b> so that the device <b>10</b> may be inserted into the shaft <b>100</b>, as shown in <figref idref="DRAWINGS">FIG. 2</figref>. The upper member <b>20</b> may include a flange <b>26</b> of a diameter approximating that of the outside of the shaft <b>100</b>, so that flange <b>26</b> acts as a stop when the device <b>10</b> is inserted into the shaft <b>100</b>. The flange <b>26</b> may be tapered as shown. Optionally, the side walls <b>25</b> of the enlarged portion of the bore <b>24</b> may be threaded to mate with an extraction tool to facilitate removal of the device <b>10</b> from the shaft <b>100</b>.
The lower member <b>30</b>, the main body of which will generally be of a cylindrical shape, includes a second post <b>32</b> extending up from its upper surface. The second post <b>22</b> is concentric with (or coaxial with) the lower member <b>30</b>. A second axial bore <b>36</b> extends through the second post <b>32</b> and into the main body of the lower member <b>30</b>. The second axial bore is threaded complementary to the threaded portion of the barrel <b>42</b> of screw <b>40</b>. Depending on the length of the upper cylindrical member <b>20</b> and the screw <b>42</b>, the second axial bore <b>36</b> may extend completely through the second member <b>30</b>, as shown in <figref idref="DRAWINGS">FIG. 2</figref>. In other embodiments, the second axial bore may terminate short of the bottom of the lower member <b>30</b>.
The expander ring <b>50</b> fits between the upper member <b>20</b> and the lower member <b>30</b>. Specifically, the expander ring <b>50</b> is annular or hollow, with its inner void being referred to as a third axial bore <b>52</b>. The third axial bore <b>52</b> is sized so that the expander ring <b>50</b> fits snugly onto the first post <b>22</b> and the second post <b>32</b>. In a preferred embodiment, as shown in <figref idref="DRAWINGS">FIG. 3</figref>, the diameter of the second post <b>32</b> is larger than that of the first post <b>22</b> and is sufficient to force the expander ring <b>50</b> to expand radially when the ring <b>50</b> is pushed onto the second post <b>32</b>. This expansion tends to prevent the lower member <b>30</b> from rotating as the screw is turned during installation and removal of the device <b>10</b> from the shaft <b>100</b>.
An alternative embodiment is shown in <figref idref="DRAWINGS">FIGS. 4-6</figref>. This embodiment is utilized for heavier weights where the length of the upper cylindrical member <b>20</b>, alone or in combination with the length of the expander ring <b>50</b>, may exceed the length of the screw <b>40</b>, as shown in <figref idref="DRAWINGS">FIG. 5</figref>. To accommodate this, the lower member <b>30</b> further comprises an elongate cylindrical extension <b>34</b>, concentric with the second post <b>32</b>, that extends up through the expander ring <b>50</b> and into the first axial bore <b>24</b> of the upper cylindrical member. In this embodiment, the axial bore <b>24</b> is enlarged slightly to receive the extension <b>34</b>. The second axial bore <b>36</b> begins at the upper terminus of the extension <b>34</b> and extends axially of sufficient length to receive the barrel <b>42</b> of the screw <b>40</b>. A portion of the second axial bore <b>36</b> is threaded as shown.
The upper and lower members <b>20</b> and <b>30</b> of the device <b>10</b> may be constructed from any suitably durable and rigid material, including metals such as brass, aluminum, lead, tungsten, titanium, stainless steel, nickel and their alloys. For simplicity, when a metal is identified herein, such as tungsten, such identification refers to the metal and its alloys known in the art. It is contemplated that composite materials also could be used. The component parts may be manufactured by any conventional machining, casting, molding, or other fabrication technology. Alloys of brass and aluminum are preferred for their relatively low cost, availability, durability, and ease with which they may be worked.
The expander ring <b>50</b> may be made from any deformable material with good durability, such as a polymer. The polymer material may be reinforced with a non-polymeric material, such as strands of nylon, to add strength and control the deformation characteristic.
In either embodiment, the principle of operation is the same. The expander ring <b>50</b> is mounted on the first and second posts of the upper and lower members <b>20</b> and <b>30</b>, respectively. The screw <b>40</b> is inserted through the first axial bore <b>24</b> of the upper member <b>20</b> and is threaded a few turns into the second axial bore <b>36</b>. This assembly is inserted into the hollow shaft <b>100</b> the desired distance, or, in an embodiment with a flange <b>26</b>, until the flange <b>26</b> abuts the upper end of the shaft <b>100</b>. (In the first embodiment the barrel <b>42</b> of the screw <b>40</b> extends through the third axial bore <b>52</b> of the expander ring <b>50</b>, and in the second embodiment, the extension <b>34</b> extends through the third axial bore <b>52</b>. In either case, the screw <b>40</b> threads into the second axial bore <b>36</b>.) As the screw <b>40</b> is tightened into the second axial bore <b>36</b>, the screw's cap <b>44</b> bears down on the shoulder formed at the terminus of the enlarged portion of the first axial bore <b>24</b> and the lower member <b>20</b> is pulled upwards. This screw action longitudinally compresses the expander ring <b>50</b> between the upper and lower members <b>20</b> and <b>30</b> causing the ring to expand radially. This expansion creates a secure friction fit of the device <b>10</b> within the shaft <b>100</b>. The friction fit achieved by the expander ring <b>50</b> allows the dimensions of the upper and lower members <b>20</b> and <b>30</b> to be conservatively sized to fit shafts having varying internal diameters.
Devices <b>10</b> having a range of weights can easily be manufactured by making upper cylindrical members of varying lengths or of materials of varying densities (e.g., tungsten, brass, aluminum), or a combination of the two. The device <b>10</b> is easily inserted into and secured in a club without the use of adhesives. After loosening the screw <b>40</b>, the device <b>10</b> may be easily extracted from a club by threading an extraction tool into the threads <b>25</b> on the upper portion of the first axial bore <b>24</b> and pulling. In this way, a range of weights can be tested until a weight providing optimum feel for a given club is selected.
Although the present invention has been described and shown in considerable detail with reference to certain preferred embodiments thereof, other embodiments are possible. The foregoing description is therefore considered in all respects to be illustrative and not restrictive. Therefore, the present invention should be defined with reference to the claims and their equivalents, and the spirit and scope of the claims should not be limited to the description of the preferred embodiments contained herein.
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48 transactions on the USPTO file
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| Maintenance Fee Reminder MailedREM. | REM. | |
| Correspondence Address ChangeC.AD | C.AD | |
| Recordation of Patent Grant MailedPGM/ | PGM/ | |
| Patent Issue Date Used in PTA CalculationAllowedPTAC | PTAC | |
| Issue Notification MailedAllowedWPIR | WPIR | |
| Dispatch to FDCD1935 | D1935 | |
| Application Is Considered Ready for IssuePILS | PILS | |
| Issue Fee Payment VerifiedN084 | N084 | |
| Issue Fee Payment ReceivedIFEE | IFEE | |
| Mail Notice of AllowanceAllowedMN/=. | MN/=. | |
| Notice of Allowance Data Verification CompletedAllowedN/=. | N/=. | |
| Date Forwarded to ExaminerFWDX | FWDX | |
| Response after Final ActionA.NE | A.NE | |
| Miscellaneous Incoming LetterLET. | LET. | |
| Mail Final Rejection (PTOL - 326)Final rejectionMCTFR | MCTFR | |
| Final RejectionFinal rejectionCTFR | CTFR | |
| Date Forwarded to ExaminerFWDX | FWDX | |
| Response after Non-Final ActionA... | A... | |
| Request for Extension of Time - GrantedXT/G | XT/G | |
| Mail Non-Final RejectionNon-final rejectionMCTNF | MCTNF | |
| Non-Final RejectionNon-final rejectionCTNF | CTNF | |
| Date Forwarded to ExaminerFWDX | FWDX | |
| Fee Payment Recorded (fees filed separately e.g. not with original papers, etc).FEE. | FEE. | |
| Mail Notice of Required Fees DueMNFEE | MNFEE | |
| Fee (additional) Due NoticeNFEE | NFEE | |
| Date Forwarded to ExaminerFWDX | FWDX | |
| Response to Election / Restriction FiledELC. | ELC. | |
| Request for Extension of Time - GrantedXT/G | XT/G | |
| Mail Restriction RequirementMCTRS | MCTRS | |
| Restriction/Election RequirementCTRS | CTRS | |
| Case Docketed to Examiner in GAUDOCK | DOCK | |
| PG-Pub Issue NotificationPG-ISSUE | PG-ISSUE | |
| IFW TSS Processing by Tech Center CompleteTSSCOMP | TSSCOMP | |
| Application Dispatched from OIPEOIPE | OIPE | |
| Application Dispatched from OIPEOIPE | OIPE | |
| Application Is Now CompleteCOMP | COMP | |
| Sent to Classification ContractorPGPC | PGPC | |
| Cleared by OIPE CSRL194 | L194 | |
| IFW Scan & PACR Auto Security ReviewSCAN | SCAN | |
| Initial Exam Team nnIEXX | IEXX | |
| Information Disclosure Statement consideredIDSC | IDSC | |
| Information Disclosure Statement (IDS) FiledWIDS | WIDS | |
| Reference capture on IDSRCAP | RCAP | |
| Information Disclosure Statement (IDS) FiledM844 | M844 |
9 legal events, as the office reported them to INPADOC
Over the term
Point at a mark for the eventEvents
| Event | Code | |
|---|---|---|
| Lapsed due to failure to pay maintenance feeLapsedFP | FP | |
| Lapse for failure to pay maintenance feesLapsedPATENT EXPIRED FOR FAILURE TO PAY MAINTENANCE FEES (ORIGINAL EVENT CODE: EXP.); ENTITY STATUS OF PATENT OWNER: SMALL ENTITYLAPS | LAPS | |
| Information on status: patent discontinuationPATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362STCH | STCH | |
| Fee payment procedureMAINTENANCE FEE REMINDER MAILED (ORIGINAL EVENT CODE: REM.); ENTITY STATUS OF PATENT OWNER: SMALL ENTITYFEPP | FEPP | |
| Fee payment procedure7.5 YR SURCHARGE - LATE PMT W/IN 6 MO, SMALL ENTITY (ORIGINAL EVENT CODE: M2555)FEPP | FEPP | |
| Maintenance fee paymentMAFP | MAFP | |
| Fee payment procedureMAINTENANCE FEE REMINDER MAILED (ORIGINAL EVENT CODE: REM.)FEPP | FEPP | |
| Fee paymentFPAY | FPAY | |
| Information on status: patent grantGrantedPATENTED CASESTCF | STCF |
Numbers
- Publication
- 07699718
- Publication, DOCDB
- 7699718
- Publication, EPODOC
- US7699718
- Application
- 11726281
- Application, DOCDB
- 72628107
- Application, EPODOC
- US20070726281
Titles
- English
- Apparatus for weighting golf club shaft
Patent term adjustment
- A delay
- +28 daysthe office missed an examination deadline
- B delay
- +30 dayspendency past three years
- Applicant delay
- −62 days
- Net adjustment
- 0 days
Classification
- CPC, 5
- A63B53/00
- A63B2209/00
- A63B60/24
- A63B60/42
- A63B60/00
- IPC, 1
- A63B53 16
- USPC, 1
- 473297000